Diversity of phytoplankton in Thon canal at Thung Lan subdistrict, Khlong Hoi Khong district, Songkhla Province
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This research focused on phytoplankton diversity and water quality in Thon Canal, Thung Lan Sub-district, Khlong Hoi Khong District, Songkhla Province. Samples were collected monthly from August-December 2020 and January-July 2021, at three sampling stations. This study revealed that phytoplankton were found in six divisions, including Chlorophyta, Bacillariophyta, Pyrrophyta, Chrysophyta, and Euglenophyta. Among these divisions, The Chlorophyta division was the most abundant, with 29 genera, making up 46.03 % of the total number of phytoplankton genera identified. The most common phytoplankton had a frequency percentage of 100 %, consisting of 25 genera. Most of these genera were discovered within the Chlorophyta and Bacillariophyta divisions. The percentage species composition was classified according to the taxonomic hierarchy of the most common division, Bacillariophyta (43.15 %), and by the taxonomic hierarchy of the most common genus, Navicula spp. (20.59 %). The phytoplankton species diversity index at Station 2 was the highest, with a value of 2.55. The richness index was found to be highest in August 2020, reaching 5.88. Phytoplankton that were frequently found in all stations and had high densities, which were the dominant phytoplankton genera, included Fragilaria spp. (diatom group), Oscillatoria spp. (blue-green algae group), and Trachelomonas spp. (euglenoid group). The water's pH showed a correlation of 0.361 with the phytoplankton community. The findings of this study raised awareness within the community about the significance of water sources and the diversity of aquatic life within them. As a result, there was a collaborative effort to develop a plan for cultivating environmentally friendly aquatic species.
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